netdev - Re: [PATCHv3 iproute2-next 0/5] iproute2: add libbpf support

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Date:   Thu, 12 Nov 2020 20:55:55 -0700
From:   David Ahern <dsahern@...il.com>
To:     Daniel Borkmann <daniel@...earbox.net>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Stephen Hemminger <stephen@...workplumber.org>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Jiri Benc <jbenc@...hat.com>,
        Edward Cree <ecree@...arflare.com>,
        Hangbin Liu <haliu@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        David Miller <davem@...emloft.net>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Andrii Nakryiko <andrii@...nel.org>
Subject: Re: [PATCHv3 iproute2-next 0/5] iproute2: add libbpf support

On 11/12/20 4:20 PM, Daniel Borkmann wrote:
> built-in given it otherwise comes with the base distro already. But then
> my question is what is planned here as deprecation process for the built-in
> lib/bpf.c code? I presume we'll remove it eventually to move on?

It will need to follow the established deprecation pattern for N, N-1
releases (N here refers to distro LTS releases, not kernel or iproute2
releases). Meaning, for the next few years it needs to exist as an
option when libbpf is not installed. After that we can add a deprecation
warning that libbpf is preferred, and then at some point in the distant
future it can be removed.